Sony sa w 541 service manual

Page 1

_ SA-WAAl/WAAZ/WSAI/WBAZ

SERVICE MANUAL

Discard SA-W441/W442NV541NV542
Service Manual (NO.9-959<324-11,
-91) previously issued. This Service
Manual contains it.

US Model

SA-W44 1/W442/W54 1/W542

Canadian Model

SA- W542

AEP Model

SA- W542

E Model

SA- W542

Mexican Model
SA- W44 1/W542

Photo: SA-W541

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS
(Except AEP model)

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:

With 8-ohm loads, both channels driven,

from 70 - 20,000 Hz; rated 100 watts per
channel minimum RMS power, with less than
0.9% total harmonic distortion from 250
milliwatts to rated output.

Amplifier section

Overall output
SA-W44l/W442: 120 W + 120 W (US model)
80 W + 80 W (Mexican model)
(front, at 1 kHz, 8 ohms)
40 W (super woofer, at 40 Hz, 4 ohms)
SA-W541/W542: 120 W + 120 W (US, Canadian, E model)
80 W + 80 W (AEP, Mexican model)
(front, at rear/center off at 1 kHz, 8 ohms)
20 W + 20 W (rear, at center off at 1 kHz,
8 ohms)
40 W (center, at rear off at 1 kHz, 6 ohms)
40 W (super woofer, at rear/center off at
40 Hz 4 ohms) (Except AEP model)
30 W (super woofer, at rear/center off at
40 Hz 4 ohms) (AEP model)
Harmonic distortion
SA-W44l/W442: Less than 0.9 % (at 1 kHz, 8 ohms loads,
front: 120 W + 120 W, super woofer off)
SA-W54l/W542 (Except AEP model):
Less than 0.9 % (at 1 kHz, 8 ohms loads,
front: 120 W + 120 W, rear/center/
super woofer off)

Output
FRONT SPEAKERS:
Accept speakers of 8 - 16 ohms
REAR SPEAKERS:
(SA-W541/W542)
Accept speakers of 8 - 16 ohms
CENTER SPEAKER:
(SA-W541/W542)
Accept speaker of 6 - 16 ohms

HEADPHONES:
Accepts low and high impedance
Headphones
Type Active super woofer (magnetically
shielded design)
Speaker unit Woofer: 20 cm (8 inches) cone type

Reproduction frequency range

25 Hz to 150 Hz

Power requirements

120 V AC, 60 Hz (Except AEP model)

220 - 230 V AC, 50/60 Hz (AEP model)
Power consumption
SA-W44l/W442: 230 W (US model)

200 W (Mexican model)
SA-W54l/W542: 280 W (US model)

380 VA (Canadian model)

310 w (E model)

250 W (AEP, Mexican models)

-Continued on next page-

Active Super Wunler

SONY;

Page 2

Dimensions
(193/4 x 183/4 x 183/4 inches)

(including projecting pans and controls)

Mass
SA-W441/W442:

Approx. 30.3 kg (66 lb 13 oz)
SA-W541/W542:

Approx. 31.0 kg (68 lb 6 oz)

SAFETY CHECK-OUT

After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:

Check the antenna terminals, metal trim, metallized
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5 mA (500 microampers). Leakage
current can be measured by any one of three
methods.

I. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers instructions to use these instm-
ments.

2. A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.

3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The limit indication is 0.75 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are
suitable. (See Fig. A)

Approx. 500 x 475 x 475 mm (w/h/d)

To Exposed Metal
Part: on Set

/ AC
voltmeter
I0. 75 VI

0.15uF I % 1.5m

J

F Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

TABLE OF CONTENTS
m Me
1 _ G E N E R A L .................................................................. 3
2. DIAGRAMS
24' Circuit Boards Location ................................................... 4
2-2. Semiconductor Lead Layouts ------------------------------------- 4

4. ELECTRICAL PARTS LIST

2-3. Printed Wiring Boards
(Former Type)
(New Type) """

2" Schematic Diagram ...................................................... 11

3. EXPLODED VIEW
3-1.

Cabinet Section

MODEL IDENTIFICATION

SONY; MODEL NO.

ACTIVE SUPER WOOFER

7//////////////////////A

SERIAL NO.
MADE IN JAPAN

SA-W441, W442 (US model) : AC 120V 60HZ 230W

SA-W441 (Mexican model)

:AC 120V 60HZ 200W

SA-W541, W542 (US model) : AC 120V 60Hz 280W
SA-W542 (Canadian model) : AC 120V 60Hz 380VA

SA-W542 (Mexican model)
SA-W542 (E model)
SA-W542 (AEP model)

: AC 120V 60Hz 250W

SAFETYvRELATED COMPONENT WARNINGI I

COMPONENTS IDENTIFIED BV MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

ATTENTION AU\COMPO'SANT AVANT RAPPORT
A LA SECURITE!

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A
sun LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES som CRITIQUEs POUR LA sécumré
DE FONCTIONNEMENT. NE REMPLACER ces com-
POSANTS oue PAR DES PIECES SONY DONT LES
NUMénos SONT DoNNés DANS ce MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR SONY.

Page

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.................................... 16

: AC 220 - 240V ~50/60HZ 310W
: AC 220 - 230V ~50/60HZ 250W